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for making effective back kinks do the following:
create controversy, use homour, use social media , participate in blog and forum posting. this will improve pr

PR is replaced by domain authority and page authority.

If you want a good backlink then create very valuable content and unique, If it will rank higher in google then few high authority site will show your content as a example or give a backlink to your site.

Not exactly can say which is the most but you can make backlinks from truth resources and your contents related to backlinks should be good and qualified. In addition, you can make about 20 - 30 backlinks per a day then the search engines will evaluate your page highly and you may have a high rank in the search result.

for effective link building start good profile link creations, business listing and effective forums more 7 page forum discussion will help you in ranking factors and even you can get some page rank traffic too